ABSTRACT The present work describes the effect of Ni/Fe ratio on microstructure, tensile flow and work hardening behaviour of tungsten heavy alloys (WHAs) based on 92 wt. % W with varying Ni/Fe ratios in heat treated and swaged conditions. Evaluation of properties in the heat treated and swaged conditions reflect that the increasing Ni/Fe ratio has resulted in the enhancement of tensile as well as impact properties. Quantitative metallography and fractography have been conducted to identify the role of microstructural attributes on the failure behaviour in both the tensile and impact energy tests. The properties improvements at higher Ni/Fe ratios are due to the realisation of microstructure comprising relatively higher dissolved W in the matrix phase, higher volume fraction of matrix and reduced contiguity of W particles. True stress–true plastic strain curves of present alloys on log–log scale display two- and single-slopes in heat treated and swaged conditions, respectively. The instantaneous work hardening curves reveal the presence of three distinctive regimes (I, II and III) in heat treated and swaged conditions. The second derivatives of true stress–true plastic strain curves are parabola.

中文翻译：

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Ni/Fe比对热处理和锻压条件下钨重合金组织、拉伸流动和加工硬化行为的影响

摘要 目前的工作描述了 Ni/Fe 比对基于 92 wt. 的钨重合金 (WHA) 的微观结构、拉伸流动和加工硬化行为的影响。在热处理和型锻条件下，随着 Ni/Fe 比率的变化，% W。在热处理和型锻条件下的性能评估表明，Ni/Fe 比的增加导致拉伸和冲击性能的提高。已经进行了定量金相学和断口分析，以确定微观结构属性对拉伸和冲击能量测试中破坏行为的作用。在较高 Ni/Fe 比率下的性能改进是由于实现了包含相对较高的基体相中溶解的 W、较高的基体体积分数和降低的 W 颗粒邻接度的微观结构。当前合金在对数-对数刻度上的真实应力-真实塑性应变曲线分别在热处理和型锻条件下显示出双斜率和单斜率。瞬时加工硬化曲线揭示了在热处理和型锻条件下存在三种不同的状态（I、II 和 III）。真应力-真塑性应变曲线的二阶导数是抛物线。